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Re: [GMCnet] Olds Heads [message #324398 is a reply to message #324396]

Tue, 26 September 2017 15:13

emerystora

Messages: 4442
Registered: January 2004

Karma:

Senior Member

I fist posted this to the list back in 2004.

Many of the GMC motorhomes use J heads.

According to information that Dick Paterson published a few years back here is the head information.

Those with “soft” seal areas that require hardened exhaust seat inserts:

455 1966 B
455 67-69 C
455 68-69 D
455 68-70 E
455 1970 F
all of the above were for leaded fuels

Those with hardened seal areas that don’t require inserts:

455 1971 H
455 71-72 G
455 1972 Ga
455 71-72 J
455 73-76 (Cutlass) K
455 73-76 (Marine / Irrigation) K

403 77-79 4A

These all were for unleaded fuels.

Note that this information was for all applications of the 455, not just the GMC motorhome.

I have just created a gmcphotos.com album which has a more comprehensive listing.
See it at:
http://www.gmcmhphotos.com/photos/g7088-olds-big-block-heads.html

Emery Stora
77 Kingsley
Frederick, CO

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[Message index]

		Oldsmobile 455 heads G vs J By: Matt Colie on Sat, 23 September 2017 20:39
		Re: Oldsmobile 455 heads G vs J By: Carl S. on Sat, 23 September 2017 22:15
		Re: Oldsmobile 455 heads G vs J By: dr.diesel on Mon, 25 September 2017 18:01
		Re: Oldsmobile 455 heads G vs J By: bwevers on Tue, 26 September 2017 00:00
		Re: Oldsmobile 455 heads G vs J By: roy1 on Tue, 26 September 2017 11:50
		Re: [GMCnet] Oldsmobile 455 heads G vs J By: James Hupy on Tue, 26 September 2017 13:39
		Re: [GMCnet] Olds Heads By: emerystora on Tue, 26 September 2017 15:13
		Re: [GMCnet] Oldsmobile 455 heads G vs J By: Emery Stora on Tue, 26 September 2017 18:10
		Re: [GMCnet] Oldsmobile 455 heads G vs J By: Carl S. on Tue, 26 September 2017 21:34
		Re: [GMCnet] Oldsmobile 455 heads G vs J By: James Hupy on Wed, 27 September 2017 11:31
		Re: Oldsmobile 455 heads G vs J By: Matt Colie on Tue, 26 September 2017 16:31

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